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Browse Prior Art Database

Individual Print Hammer Blocking

IP.com Disclosure Number: IPCOM000101334D
Original Publication Date: 1990-Aug-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Dayger, DA: AUTHOR

Abstract

A blocking table, with an entry for each print hammer, is used to block the firing of individual hammers. A first-in, first-out (FIFO) queue is used to control the resetting of entries in the blocking table.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 90% of the total text.

Individual Print Hammer Blocking

       A blocking table, with an entry for each print hammer, is
used to block the firing of individual hammers.  A first-in,
first-out (FIFO) queue is used to control the resetting of entries in
the blocking table.

      The control of print hammers, on a band printer, is generally
viewed as a repetitive process, which may be partitioned into equal
time segments.  The length of time represented by a single time
segment will depend on the particular embodiment selected.

      The hammer settling queue is a FIFO queue.  Each element in the
queue may contain either a hammer address or a unique flag code.  The
hammer settling queue is initialized to contain a number of flag code
elements equal to the number of time segments for which it is desired
to block any hammer from refiring.  At some fixed point in each time
segment (usually the beginning or end) an additional flag code
element is pushed on the queue and elements are popped off from the
queue until an element containig a flag code is detected. Therefore,
the hammer-settling queue contains a constant number of flag code
elements.

      When a hammer is fired, its entry in the blocking table is set,
to prevent further firing of that hammer.  When a hammer is reset,
the hammer address is pushed onto the hammer settling queue.  When a
hammer address is popped off from the hammer settling queue, the
entry in the blocking table, associated with that hammer address, i...